package schoolEmployeeTest;

import java.util.Scanner;

/**
 * @ClassName meituan1
 * @description:
 * @author: 荣燊
 * @create: 2022-04-23 17:29
 **/
public class meituan1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        String s = scanner.nextLine();
        char[] chars = s.toCharArray();
        int res = 0;

//        for (int i=0; i<chars.length; i++) {
//            if
//        }

        System.out.println(res);
    }
}
